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| Productive Time, Time Effective, Work Efficiency, Production, Work Obstacle, Sieve Analysis, Experiment of Moisture (2) |
| Teknik Pertambangan (2) |
| Waktu Produktif, Waktu Efektif, Efisiensi Kerja, Produksi, Hambatan Kerja, Analisis Ayak, Uji Kadar Air A. Pendahuluan (2) |
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